exp8.asm

ADuc812的各种功能程序的例子!很有参考价值

SP       DATA  081H  ;STACK POINTER	
DPL      DATA  082H  ;DATA POINTER - LOW BYTE
DPH      DATA  083H  ;DATA POINTER - HIGH BYTE
DPP      DATA  084H  ;DATA POINTER - PAGE BYTE
PSW      DATA  0D0H  ;PROGRAM STATUS WORD
ACC      DATA  0E0H  ;ACCUMULATOR

io_page		equ	04h
digin_port	equ	0006h
ledout_port  	equ	0007h


		org 	0000h
		ljmp	main
	
		org  0100h	
main:		mov sp,#80h
	
start:		nop
		mov dpp,#io_page
		mov dptr,#digin_port	
		movx a,@dptr
		mov dptr,#ledout_port
		movx @dptr,a	
		ajmp  start	

		end